Current setup, 3 500gb sata drives, each with 3 partitions.
The first partition of each drive make up raid1 md0 boot and most software
The next partition of each drive make up raid1 md1 swap
The 3rd partition of each drive make up raid5 md2 main data storage
There is also a 40gb ide drive with 2 partitions, boot/software and
swap. It was used for install and setup. But I never got boot changed
over to md0. So currently md0 is not in use. md0 and md2 are mounted to
folders on the 40gb so a precopy to md0 could be made before booting
with a cd and copying what ever is left that needs coping. and to use md2.
Current
# /etc/fstab: static file system information.
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc defaults 0 0
/dev/hda1 / ext3 defaults,errors=remount-ro 0 1
/dev/hda5 none swap sw 0 0
/dev/md0 /mnt/md0 ext3 defaults 0 0
/dev/md2 /mnt/md2 ext3 defaults 0 0
/dev/hdb /media/cdrom0 udf,iso9660 user,noauto 0 0
/dev/fd0 /media/floppy0 auto rw,user,noauto 0 0
I want to change md0 and md1 from 3 drive mirriors to 2 drive mirrors.
Finish changing over to booting from md0, move swap to md1 and move the
mount point for md2 to md0
Remove the the ide drive to free up space for the 4th 500gb drive.
Copy md2 over to the new 500gb temparally.
Get rid of the current md2 freeing up the 3rd drive since it was already
taken out of the mirrors above.
Make a new md2 raid1 with the remaining space of the first 2 sata drives.
Move the data from the 4th drive back to the new md2
Repartition the 3rd drive to 1 partition same as the 4th drive.
Make raid1 md3 from the 3rd and 4th drives.
It's the steps/commands to change md0 and md1 from 3 drive mirrors to 2
drive mirrors that I'm not sure about. Though now looking at fstab I see
I never even switched over the swap. So I guess, those to arrays would
be rebuilt. So it's more how to do that without messing with md2.
The computer is still on grub1. I haven't updated it it.
On 3/4/2010 3:45 PM, Michael Evans wrote:
On Wed, Mar 3, 2010 at 7:19 PM, Timothy D. Lenz<tlenz@xxxxxxxxxx> wrote:
Some time back I started setting up a couple of vdr computers with raid. The
one with 3 500gb drives, I setup 2 raid 1 partitions with 1 spare fo boot
and swap and used the rest of the 3 drives for a raid5 array. I had problems
getting it to boot, and it was advised to change the raid 1 arrays to 3
mirror which I did. Bu I got busy with other things and never tried to
switch it to boot from the arrays. Since then I aquired a 4th drive same
size and model. I want to change md0/1 back to 2 drive mirrors and change
md2 from raid5 to raid1 freeing up a drive which I then want use to with the
new drive to create another raid1 array. Before I can install the new drive,
I need to get it booting from md0 so I can remove the old ide drive.
I figure I need to shrink md0 and md1 and then fail the 3rd drive in each of
those 2 arrays before changing them to 2 drive arrays? I find lots of stuff
about adding drives, but not much about removing the drives or how to change
them back to 2 drive arrays.
Once md0 and md1 are back to 2 drives and it's booting, then I'll install
and format the new drive and copy the contents of md2 over. Then I need to
remake md2 as a 2 drive raid1. Then copy the data back and i'll have 2
drives to make md3.
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Let's divide that problem up in to more manageable chunks.
1) Boot - This is small and trivial to backup and restore.
2) Swap - Not often /required/ and thus can be disabled and erased.
3) Raid5 - Your data, which you want to convert from Raid5 to Raid1 storage.
The absolute easiest (and safest) thing to do is to backup your data,
verify the backup, then erase all the disks and start clean.
Otherwise the issues will have to be handled in the listed order:
1) Boot
If you are using 'Grub 2' (non grub legacy) then it wants EITHER mdadm
label 0.90 OR the option beneath.
Otherwise you must use mdadm label format 0.90 or, IIRC 1.0 (metadata
at the end of the area), and specify the device not as /dev/mdX but as
one of the member devices. You will have to manually mirror or
duplicate the install sections.
2) swapoff, mdadm -S the device
3) Maybe someone else can help with the takeover? In any event we DO
need more directions. You're trying to go from 2 usable drives worth
of storage to 1, which isn't going to work.
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